DE102004037954A1 - Device for surface blasting of components - Google Patents

Abstract

The The invention relates to a device for surface blasting, in particular for ultrasonic shot peening, of components, in particular of gas turbine components, with at least one vibrating surface vibrator, in particular with at least one ultrasonic sonotrode, wherein to the or each vibrating surface of the or each vibrator a processing chamber for receiving a portion to be radiated connects the component to be machined. According to the invention Processing chamber (15; 31) in the cross section of at least three legs limited, namely at least two substantially vertically extending legs (17, 18, 32, 33) and at least one substantially horizontal extending legs of the processing chamber (15; 31) of oscillating surfaces each of a vibrator are formed.

Description

The The invention relates to a device for surface blasting, in particular for ultrasonic shot peening, of components, in particular gas turbine components, according to the preamble of claim 1.

Gas turbines, In particular, aircraft engines, in particular, in the area a compressor and a turbine over at least one with rotating Blades filled Rotor, wherein the rotating blades of the gas turbine profiled either over Shovel feet in recesses anchored the gas turbine rotor or integral part of a Gas turbine rotor are. Are the blades over shovel feet in corresponding Recesses of the rotor anchored, so are the shovel feet either according to the so-called fir tree design or after profiled the so-called dovetail design (dove tail design). The preferably fir tree profiled or dovetail profiled Areas of a blade root a gas turbine blade are also referred to as support flanks or wings. While the operation of a gas turbine, the blade feet are at their profiled wings in particular strong due to fretting claimed. The wear rate in the area of the blade feet can be reduced by the fact that the blade feet on their wings through special surface treatment methods be solidified. A similar Problem arises also with integrally bladed gas turbine rotors, which solidifies in the area of its rotor disks to minimize the wear rate become. Also be shovels hardened by gas turbine blades on their surfaces to minimize wear rate.

As a surface treatment method for solidifying components, in particular gas turbine components such as gas turbine blades, preferably shot peening is used. In conventional shot peening, a significant surface roughening at the blasted surfaces can occur. In order to improve the machining quality which occurs during shot peening, it is known from the prior art US 6,536,109 B2 already known, for example, to consolidate blade roots of gas turbine blades in the region of their profiled wings by ultrasonic shot peening.

So revealed the US 6,536,109 B2 a corresponding device with an ultrasonic sonotrode, wherein the ultrasonic sonotrode has a horizontally or horizontally extending, vibrating or vibrating surface, and wherein above this vibrating surface extends a processing chamber in which gas turbine blades with their blade roots for processing the same in the area their wings are arranged standing. According to the US 6,526,109 B2 In this case, the gas turbine blades to be machined are aligned such that the profiled bearing surfaces of the blade roots to be machined run substantially perpendicular to the oscillating surface of the ultrasonic sonotrode. This only an insufficient quality can be achieved during shot peening of the profiled wings of the blade roots. Furthermore, with the in the US 6,526,109 B2 Blasting thin-walled components not possible, since such thin-walled components would be exposed to an undue deformation during processing in this known from the prior art device.

Of these, Based on the present invention, the problem underlying a novel device for surface blasting, in particular for Ultrasonic shot peening to create components.

This Problem is solved by a device in the sense of claim 1 solved. According to the invention Processing chamber in cross section of at least three legs limited, namely at least two substantially vertically extending legs and at least one substantially horizontally extending Leg, wherein at least the vertical legs of the Processing chamber of vibrating surfaces of each one vibrator are formed. The processing chamber is W-shaped in cross-section or V-shaped formed, wherein at least the vertically extending legs the in cross-section W-shaped or V-shaped trained processing chamber of vibrating surfaces respectively a vibrator are formed. The horizontally extending legs can as surfaces each of a vibrator or be designed as injectors, wherein the injectors return the balls on the vibrating, substantially vertical legs move.

With the device according to the invention for surface blasting of components, a significantly better quality of machining of the surfaces of a component to be machined can be achieved compared to the devices known from the prior art. Furthermore, the device according to the invention makes it possible, for example, to machine blade roots or blade leaves of gas turbine blades in such a way that sections to be consolidated are simultaneously blasted from two opposite sides. As a result, on the one hand, the effectiveness of surface spraying is increased On the other hand, inadmissible deformations of the thin-walled component sections, which are to be irradiated, are avoided, especially with thin-walled components. With the device according to the invention, even thin-walled disks with so-called wings on integrally bladed gas turbine rotors can be bombarded with high intensity during ultrasonic shot peening without unduly deforming these complex-shaped components during surface blasting.

To a preferred embodiment of the invention is in cross section W-shaped or V-shaped formed processing chamber of two outer, essentially vertical extending long thighs and at least one inner, essentially bounded horizontally extending short leg, each of the Legs of a vibrating surface each of a vibrator is formed. Preferably, in transition areas between outer, long Thighs and inner, short thighs or in low points of in cross-section W-shaped or V-shaped trained processing chamber each have a further oscillating surface of a Vibrators positioned or it is an injector for the balls intended.

preferred Further developments of the invention will become apparent from the dependent claims and the following description. Embodiments of the invention without being limited to this to be closer to the drawing explained. Showing:

1 a highly schematic representation of a device according to the invention for surface blasting, in particular for ultrasonic shot peening, when blasting a gas turbine blade in the region of a blade root;

2 the device according to the invention for surface blasting, in particular for ultrasonic shot peening, when blasting a rotor disk of an integrally bladed gas turbine engine;

3 the device according to the invention for surface blasting, in particular for ultrasonic shot peening, when blasting an airfoil of an integrally bladed gas turbine engine;

4 the device according to the invention for surface blasting, in particular for ultrasonic shot peening, when blasting a thin-walled wing of an integrally bladed gas turbine engine; and

5 a highly schematic representation of another device according to the invention for surface blasting, in particular for ultrasonic shot peening, when blasting a gas turbine blade in the region of a blade root.

Hereinafter, the present invention will be described with reference to FIG 1 to 5 described in more detail.

1 shows a highly schematic of a device according to the invention 10 for ultrasonic shot peening in conjunction with a gas turbine blade 11 used in the device according to the invention 10 on profiled support flanks or wings 12 respectively. 13 a blade foot 14 to radiate is. As 1 can be removed, this projecting the gas turbine blade 11 with the blade foot 14 in a processing chamber provided by the device according to the invention 15 into it, with an in 1 not to be processed airfoil 16 the gas turbine blade 11 from the processing chamber 15 the device according to the invention 10 protrudes.

In the embodiment of 1 is the processing chamber 15 in cross-section W-shaped or marked by a W-profile. So is the cross-sectionally W-shaped processing chamber 15 of two outer, substantially vertical long legs 17 and 18 as well as two inner, substantially horizontally extending short legs 19 and 20 limited. According to the invention, each of these legs 17 . 18 . 19 and 20 from a vibrating surface of a vibrator, namely an ultrasonic sonotrode. At the thighs 17 . 18 . 19 and 20 the W-shaped processing chamber 15 These are therefore the vibrating surfaces of ultrasonic sonotrodes, with the oscillating section of the surfaces being visualized by double arrows.

Using the trained as vibrating surfaces of ultrasonic sonotrodes thighs 17 . 18 . 19 and 20 be in the processing chamber 15 positioned, not shown balls accelerated and in the direction of the machined supporting flanks or wings 12 . 13 of the blade foot 14 spun. Above is the processing chamber 15 from a non-swinging cover 21 limited, at which the ultrasound sonotrodes accelerated spheres are reflected. From the arrangement of 1 Immediately follows that for the balls within the device according to the invention 10 or within the processing chamber 15 does not set a preferred direction. The balls are therefore distributed equally from all directions on the supporting flanks or wings to be machined 12 and 13 of the blade foot flung. This results in a particularly uniform solidification of the processed blade root 14 on the supporting flanks or wings 12 and 13 ,

For the purposes of the present invention, it is further proposed that the legs designed as vibrating surfaces of ultrasonic sonotrodes 17 and 18 the cross-sectionally W-shaped processing chamber 15 align so that the thighs 17 and 18 run substantially parallel to the radiating surface contour. In the embodiment of 1 are the supporting flanks or wings 12 and 13 of the radiant blade root 14 fir-tree profiled, and the thighs 17 and 18 are substantially parallel to an envelope 22 the fir-tree profiled support flanks or wings 12 and 13 , On the one hand, this results in good machining quality on the radiating flanks or wings 12 and 13 of the blade foot 14 feasible, on the other hand, the two supporting flanks or wings 12 and 13 be blasted simultaneously. The device according to the invention 10 thus allows the blade foot 14 at the same time from both sides, ie in the area of both wings to radiate.

As 1 can be taken not only in the area of the thighs 17 . 18 . 19 and 20 the cross-sectionally W-shaped processing chamber 15 vibrating surfaces of ultrasonic sonotrodes positioned, but also in transition areas 23 and 24 between the outer, long thighs 17 and 18 and the inner, short thighs 19 and 20 , The transition areas 23 and 24 put, so to speak, the lowest points or the low points of the W-profile of the processing chamber 15 under the influence of gravity, the balls accelerated by means of the ultrasonic sonotrodes collect in the region of these low points and are returned from the ultrasonic sonotrodes or the oscillating surfaces of the same positioned there back into the processing space 15 be hurled. Instead of ultrasonic sonotrodes may be in the transition areas 23 and 24 There may also be injectors for the balls, which move the balls back onto the vibrating legs. The vibrating sections of the transitional areas 23 and 24 positioned ultrasonic sonotrodes or injectors are in turn visualized by double arrows.

In the preferred embodiment of 1 is accordingly the cross-sectionally W-shaped processing chamber 15 limited by a total of six vibrating surfaces of corresponding ultrasonic sonotrodes or by four vibrating surfaces and two injectors. In the area of the outer, long thighs 17 and 18 and the inner, short leg 19 such as 20 In each case an ultrasonic sonotrode is positioned. On the top is the processing chamber 15 from a cover 21 locked. The in the processing chamber 15 protruding blade foot 14 can in the inventive device in a particularly effective and gentle manner on the support flanks or wings 12 and 13 be solidified. Since there is no preferred direction for the accelerated using the ultrasonic sonotrodes balls, unwanted material deformations and damage in the radiating flanks or wings 12 and 13 avoided. Furthermore, the blade root 14 from both sides at the same time, ie simultaneously in the area of both supporting flanks or wings 12 and 13 to be blasted.

2 shows the device according to the invention 10 when blasting an integrally bladed gas turbine rotor 25 in the area of a rotor disk 26 , In the example of 2 Protrusions extend 27 - Also called Wings - almost completely on the above open W-profile of the processing chamber 15 , leaving a cover at the top of the processing chamber 15 can be waived. In the embodiment of 2 becomes the rotor disk 26 blasted on both sides. In particular 2 can be taken for the results of using the in the leg 17 . 18 . 19 and 20 arranged sonotrodes accelerated balls no preferred direction, so that the accelerated balls from all directions on the surfaces to be solidified rotor disk 26 to meet. This is in 2 through the lines 28 shown schematically. Due to the fact that no preferred direction is set for the assistance of the sonotrodes accelerated balls and that, at the same time, a double-sided irradiation of the rotor disc 26 is possible, then gives a good quality in surface blasting, even if the rotor disk 26 is formed thin-walled.

3 shows the device according to the invention 10 when blasting an airfoil 29 an integrally bladed gas turbine rotor 25 , Also shovels 29 can therefore be with the help of the device according to the invention 10 to radiate effectively and gently at the same time.

4 shows the device according to the invention 10 when blasting the integrally bladed gas turbine rotor 25 in the range of a thin-walled wing 27 and a seal finisher 29 , The device 10 of the 4 is different from the devices 10 of the 1 to 3 only in that in the embodiment of the 4 the two outer long thighs 17 and 18 essentially parallel to each other. This W-shaped profile is particularly advantageous when blasting thin-walled wings.

Another preferred embodiment of the invention shows 5 , ^So shows 5 again very schematically a device according to the invention 30 for ultrasonic shot peening in conjunction with a gas turbine blade 11 used in the device according to the invention 10 on profiled support flanks or wings 12 respectively. 13 a blade foot 14 to radiate is. As 1 can be removed, this projecting the gas turbine blade 11 with the blade foot 14 in a processing chamber provided by the device according to the invention 15 into it, with an in 1 not to be processed airfoil 16 the gas turbine blade 11 from the processing chamber 15 the device according to the invention 10 protrudes. In the embodiment of 5 is the processing chamber 31 the device 30 formed in cross-section V-shaped or marked by a V-profile. Thus, the processing chamber is V-shaped in cross-section 31 of two outer, substantially vertical long legs 32 and 33 and an inner, substantially horizontally extending short leg 34 limited. Each of these thighs 32 . 33 and 34 is formed by a vibrating surface of a vibrator, namely an ultrasonic sonotrode. In the region of the substantially horizontally extending leg 34 An injector can also be positioned. It's not just in the area of the thighs 32 . 33 and 34 the cross-sectionally V-shaped processing chamber 31 vibrating surfaces of ultrasonic sonotrodes positioned, but also in transition areas 35 and 36 between the outer, long thighs 32 and 33 and the inner short leg 34 ,

It is therefore within the meaning of the present invention, a device for surface blasting to propose of components, wherein a processing chamber of the device via a W-profile or V-profile features or in cross-section W-shaped or V-shaped is formed, and wherein at least in the area of substantially vertically extending legs of the profile vibrating surfaces of Ultrasonic sonotrodes are positioned. Preferably, too in the transition area between the outer and the inner thighs, so swinging in the low point of the profiles surfaces positioned by ultrasonic sonotrodes or injectors. aid such a device is a simultaneous, double-sided ultrasonic beams of thin Components are particularly effective and gentle possible.

The inventive device is preferably used for blasting thin-walled gas turbine components, especially when blasting gas turbine blades in the area of their blade feet or airfoils and blasting integrally bladed gas turbine rotors in the area of the rotor disks and blades of the same.

10

contraption

11

Gas turbine blade

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wing

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wing

14

blade

15

processing chamber

16

airfoil

17

leg

18

leg

19

leg

20

leg

21

cover

22

envelope

23

Transition area

24

Transition area

25

Gas turbine rotor

26

rotor disc

27

Tab / Wing

28

line

29

Dichtfinträger

30

contraption

31

processing chamber

32

leg

33

leg

34

leg

35

Transition area

36

Transition area

Claims (15)

Apparatus for surface blasting, in particular for ultrasonic shot peening, of components, in particular of gas turbine components, having at least one vibrating surface vibrator, in particular having at least one ultrasonic sonotrode, wherein the or each oscillating surface of the or each vibrator is a processing chamber for Receiving a radiating portion of the component to be machined followed, characterized in that the processing chamber ( 15 ; 31 ) is limited in cross-section of at least three legs, namely at least two substantially vertically extending legs ( 17 . 18 ; 32 . 33 ) and at least one substantially horizontally extending leg ( 19 . 20 ; 34 ), wherein at least the substantially vertical legs of the processing chamber ( 15 ; 31 ) are formed by vibrating surfaces each of a vibrator. Apparatus according to claim 1, characterized in that the processing chamber ( 15 ; 31 ) is formed in cross-section W-shaped or V-shaped Apparatus according to claim 1 or 2, characterized in that the processing chamber ( 15 ) in cross-section W-shaped, with two substantially vertically extending legs ( 17 . 18 ) and two substantially horizontally extending legs ( 19 . 20 ), wherein at least the substantially vertically extending legs ( 17 . 18 ) of the cross-sectionally W-shaped processing chamber ( 15 ) are formed by vibrating surfaces each of a vibrator. Device according to one or more of claims 1 to 3, characterized in that the cross-sectionally W-shaped processing chamber ( 15 ) of two outer, substantially vertically extending long legs ( 17 . 18 ) and two inner, substantially horizontally extending short legs ( 19 . 20 ), each of the legs ( 17 . 18 . 19 . 20 ) is formed by a vibrating surface of a respective vibrator. Device according to one or more of claims 1 to 4, characterized in that in transition areas ( 23 . 24 ) between outer, long thighs ( 17 . 18 ) and inner, short thighs ( 19 . 20 ) of the cross-sectionally W-shaped processing chamber ( 15 ) in each case a further vibrating surface of a vibrator or an injector is positioned. Apparatus according to claim 5, characterized in that in the transition areas ( 23 . 24 ) positioned, vibrating surfaces or the injectors in low points of the W-profile of the processing chamber ( 15 ) are arranged. Apparatus according to claim 5 or 6, characterized in that the cross-sectionally W-shaped processing chamber ( 15 ) is bounded by six vibrating surfaces or by four vibrating surfaces and two injectors. Apparatus according to claim 1 or 2, characterized in that the processing chamber ( 31 ) is formed in cross-section V-shaped with two substantially vertically extending legs ( 32 . 33 ) and a substantially horizontally extending leg ( 34 ), wherein at least the substantially vertically extending legs of the cross-sectionally V-shaped processing chamber ( 31 ) are formed by vibrating surfaces each of a vibrator. Apparatus according to claim 9, characterized in that the substantially horizontally extending leg ( 34 ) is designed as a vibrating surface of a vibrator. Apparatus according to claim 9, characterized in that the substantially horizontally extending leg ( 34 ) is designed as an injector. Apparatus according to claim 10, characterized in that in transition areas ( 35 . 36 ) between the substantially vertically extending legs ( 32 . 33 ) and the substantially horizontally extending leg ( 34 ) of the cross-sectionally V-shaped processing chamber ( 31 ) in each case a further vibrating surface of a vibrator or an injector is positioned. Device according to one or more of claims 1 to 11, characterized in that the outer, long limbs ( 17 . 18 ; 32 . 33 ) of the cross-sectionally W-shaped or V-shaped processing chamber ( 15 ; 31 ) approximately parallel to the surface contour to be radiated or an envelope of the surface contour of the surface to be radiated into the processing chamber ( 15 ; 31 ) projecting portion of the component to be machined are aligned. Device according to one or more of claims 1 to 12, characterized in that the cross-sectionally W-shaped or V-shaped processing chamber ( 15 ; 31 ) upwards from a cover ( 21 ) is limited, wherein the component with the portion to be radiated, the cover ( 21 ) penetrates and with the part to be irradiated in the processing chamber ( 15 ; 31 ) protrudes. Use of a device according to one or more the claims 1 to 13 for simultaneous double-sided ultrasonic shot peening of components, in particular of gas turbine components. Use of a device according to one or more the claims 1 to 13 for simultaneous double-sided ultrasonic shot peening gas turbine blades or integrally bladed gas turbine rotors preferably in the area of thin-walled Sections of the same.